Adaptive frame durations for time-hopped impulse radio systems

a radio system and impulse technology, applied in the field of communication systems, can solve problems such as interferen

Inactive Publication Date: 2009-11-17
MITSUBISHI ELECTRIC RES LAB INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This adaptive approach reduces interframe interference and multiple access interference, maintaining effective data transmission while adjusting to varying environmental conditions.

Problems solved by technology

In a multi-user system, interference is due to signals from other transceivers and noise.

Method used

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  • Adaptive frame durations for time-hopped impulse radio systems
  • Adaptive frame durations for time-hopped impulse radio systems
  • Adaptive frame durations for time-hopped impulse radio systems

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Embodiment Construction

[0019]Our invention provides a system and method for adaptive selection of a frame duration for transceivers in radio system. The frame duration depends on the signal to noise and interference ratio (SNIR) and channel state information (CSI). The method can be applied to coherent transceivers in a time-hopped, impulse radio (TH-IR) system, as well as in transmitted-reference systems involving time hopping, and to time-hopping systems with incoherent transceivers. It should be noted that at any one time the transceiver can either be transmitting or receiving.

[0020]In a first step, the receiver estimates periodically 310 the CSI 311 of the, channel 301. This can be done in two ways. The receiver can estimate an instantaneous CSI or an average CSI. In the latter case, the receiver estimates a small-scale, averaged power delay profile or an approximation thereof. An accurate CSI is not necessary for the invention. An approximation of the small-scale averaged power delay profile or even ...

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Abstract

A method determines a duration of a frame in a time-hopping, impulse radio system. Channel state information of a channel between two transceivers is estimated periodically. A signal to noise and interference ratio is also estimated periodically. The frame duration of the frame is then determined according to the channel state information and the signal to noise and interference ratio.

Description

FIELD OF THE INVENTION[0001]The invention relates generally to communication systems, and more particularly to modulation formats used in wireless communication systems.BACKGROUND OF THE INVENTION[0002]In the United States, the Federal Communications Commission (FCC) allows a restricted unlicensed use of ultra-wide bandwidth (UWB) signals for wireless communication systems, “First Report and Order,” Feb. 14, 2002. The UWB signals must be in the frequency range from 3.1 to 10.6 GHz, and have a minimum bandwidth of 500 MHz. The FCC order also limits the power spectral density and peak emissions power of UWB signals to less than −43.1 dBm / MHz.[0003]One modulation method for UWB uses extremely short time pulses, e.g., 1 / 1,000,000,000 of a second or less, to generate signals with bandwidths greater than 500 MHz which corresponds to a wavelength of about 300 mm. Wireless systems that use short pulses are commonly referred to as impulse radio (IR) systems.[0004]As shown in FIG. 1A, four di...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): H04B17/00
CPCH04B1/719H04B1/7176
InventorMOLISCH, ANDREAS F.ORLIK, PHILIP
OwnerMITSUBISHI ELECTRIC RES LAB INC